dorsal/arxiv
View SchemaStudy of plasma heating in ohmically and auxiliary heated regimes in spherical tokamak Globus-M
| Authors | Nikolay Sakharov, Bayr Ayushin, Alexander Barsukov, Fedor Chernyshev, Vasily Gusev, Vladimir Leonov, Roman Levin, Vladimir Minaev, Anatoly Mineev, Igor Mironov, Michael Patrov, Yury Petrov, Gennady Tilinin, Sergey Tolstyakov |
|---|---|
| Categories | |
| ArXiv ID | physics/0410162 |
| URL | https://arxiv.org/abs/physics/0410162 |
Abstract
The ion temperature behavior in the plasma core of the spherical tokamak Globus-M (major radius 0.36 m, minor radius 0.24 m, torus aspect ratio 1.5, toroidal magnetic field near the plasma axis 0.4 T, plasma current up to 0.3 MA) was studied by means of 12-channels neutral particle analyzer (NPA) ACORD-12. The experiments were performed in ohmic regimes as well as in regimes with the ion cyclotron resonance heating (ICRH) in the vicinity of fundamental harmonic for hydrogen minority in deuterium bulk plasma and the neutral beam injection (NBI). The total auxiliary power exceeded the magnitude of 0.8-1 MW. The NPA provided the simultaneous measurements of deuterium and hydrogen energy spectra and the percentage of both isotopes. The ion temperature was studied in a wide range of the plasma current 0.08-0.3 MA and the plasma average density (1-7)x1019 m-3 at various values of the plasma vertical elongation and the triangularity. The experimental data were compared with the results of numerical simulation. We employed a simple 1D model describing the ion energy balance by using the neoclassical transport coefficients. The charge-exchange losses were also taken into account. The experimentally measured ion temperature dependence on the plasma current and plasma density differed from the Artsimovich scaling law predictions well describing the ion heating in the case of the neoclassical plateau regime in the conventional tokamak even at a relatively low temperature in ohmic plasma. In particular strong, almost linear plasma current temperature dependence was revealed. It indicates a dominating role of trapped particles in the ion energy balance at a low aspect ratio. The estimates of energy confinement time values derived from the magnetic measurements in ohmic and auxiliary heating regimes are also presented.
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"abstract": "The ion temperature behavior in the plasma core of the spherical tokamak\nGlobus-M (major radius 0.36 m, minor radius 0.24 m, torus aspect ratio 1.5,\ntoroidal magnetic field near the plasma axis 0.4 T, plasma current up to 0.3\nMA) was studied by means of 12-channels neutral particle analyzer (NPA)\nACORD-12. The experiments were performed in ohmic regimes as well as in regimes\nwith the ion cyclotron resonance heating (ICRH) in the vicinity of fundamental\nharmonic for hydrogen minority in deuterium bulk plasma and the neutral beam\ninjection (NBI). The total auxiliary power exceeded the magnitude of 0.8-1 MW.\nThe NPA provided the simultaneous measurements of deuterium and hydrogen energy\nspectra and the percentage of both isotopes. The ion temperature was studied in\na wide range of the plasma current 0.08-0.3 MA and the plasma average density\n(1-7)x1019 m-3 at various values of the plasma vertical elongation and the\ntriangularity. The experimental data were compared with the results of\nnumerical simulation. We employed a simple 1D model describing the ion energy\nbalance by using the neoclassical transport coefficients. The charge-exchange\nlosses were also taken into account. The experimentally measured ion\ntemperature dependence on the plasma current and plasma density differed from\nthe Artsimovich scaling law predictions well describing the ion heating in the\ncase of the neoclassical plateau regime in the conventional tokamak even at a\nrelatively low temperature in ohmic plasma. In particular strong, almost linear\nplasma current temperature dependence was revealed. It indicates a dominating\nrole of trapped particles in the ion energy balance at a low aspect ratio. The\nestimates of energy confinement time values derived from the magnetic\nmeasurements in ohmic and auxiliary heating regimes are also presented.",
"arxiv_id": "physics/0410162",
"authors": [
"Nikolay Sakharov",
"Bayr Ayushin",
"Alexander Barsukov",
"Fedor Chernyshev",
"Vasily Gusev",
"Vladimir Leonov",
"Roman Levin",
"Vladimir Minaev",
"Anatoly Mineev",
"Igor Mironov",
"Michael Patrov",
"Yury Petrov",
"Gennady Tilinin",
"Sergey Tolstyakov"
],
"categories": [
"physics.plasm-ph"
],
"title": "Study of plasma heating in ohmically and auxiliary heated regimes in spherical tokamak Globus-M",
"url": "https://arxiv.org/abs/physics/0410162"
},
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"variant": "snapshot-2026-03-01",
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